/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/PartyBeaconClient.h
Sends a request to the remote host to allow the specified members to reserve space in the host's session. Note this request is async.
true if the request able to be sent, false if it failed to send
virtual bool RequestReservation ( const [FOnlineSessionSearchResult](API\Plugins\OnlineSubsystem\FOnlineSessionSearchResult) & DesiredHost, const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & RequestingPartyLeader, const [TArray](API\Runtime\Core\Containers\TArray)< [FPlayerReservation](API\Plugins\OnlineSubsystemUtils\FPlayerReservation) > & PartyMembers )